Mold and process of molding faced concrete blocks



July 5, 1927.

- 1,635,093" D. M PHERSON ET AL MOLD AND PROCESS OF MOLDING FACED CQNCRETE BLOCKS Filed Sept. 9, 1924 WITNESSES A? INVENTOR goA/Aw M pHf/wo/v BY V ATTORNEYS Patented Julv5,1927.

' UNITED STATES 1 1,535,993 PATENT oFFIca.

DONALD MOPHERSON AND FREDERICK B. SCHULTZ, OF NEW YORK, N. Y., ASSIG'NOBS TO xmmorn cnunn'r isnocx co., 11m, or

NEW vonx. ,1

CORONA, NEW YORK, A CORPORATION OF 4 MOLD AND PROCESS OF MOLDING FACED CONCRETE BLOCKS.

Application filed September 9, 1924. Serial No. 786,745.

This invention relates to molds and more particularly. to a mold designed for forming concrete building blocks, an object of the invention being to provide a mold which will properly shape the block, which can be read; ily opened to discharge or release the block, and which will hold the block when partially formed so that it can be reversed and facing material located thereon.

A further object is .to provide a mold which is designed for making blocks such as disclosed in the prior application of F. B. Schultz, filed March 17, 1924, Serial No. 699,920.

A further object is to provide a mold composed of sheet metal, having means for locking the sections in rectangular formation and which means permit the ready 0 'eningor separation of the sections to disc arge the block.

A further object is to provide .a mold of this character which can and sold at a.v reasonably low price, which will have long life and which will most efliciently perform the functions for which it is intended.

With these and other objects in view, the

invention consists in certain novel features of construction .and combinations and arrangements of parts which will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings- Figure 1 is a perspective view of our improved mold showing the same 'in partially open position;

Figure 2 is a top plan view of the mold showing the form and waterproofflmaterial located thereon at the bottom of the mold;

Figure 3 is a view in vertical section il lustrating the first stage of the block molding operation;

Figure 4 is a fragmentary viewiinvertical section showing the mold reversed and illustrating the completed molding operation; p

Figure 5 is a perspective view of a block formedin our improved mold.

Our improved mold comprises four mem-' bers, namely, side members 1 and 2 and end members 3 and 4. The side members are preferably longer than the end members and all of said members are preferably composed of relatively heavy sheet metal 'havbe manufactured niiig longitudinal inwardly projecting curved 0 set portions 5. The material of the sides and ends at the offset portions are out at an angle soas to allow the members I, 2, 3 and 4 to be arranged in rectangular formation and closely fit one against the other to form a ti ht mold.

T e sides 1 and 2 are connected tothe end 3 by hinge pins 6. These hinge pins are projected through .alined sleeves 7 on the respective sections and may be permanently or removably. secured as may be desired. The end section 4 is connected to the 'side section 1 by a hinge pin 6, as above described in connection with the other'sections, but the end section 4 and side section 2 are removably connected so as to allow the sections to be swung on their hinge pins and opened as much as may be desired. 7

As a closing means for the mold, or, in other words, as a means for connecting member 4 with the side member 2, we preferably provide a pair of plungers or locking pins 8 located in sleeves 9 on side member 2 and adapted to engage in corresponding sleeves 10 on end section 4. These locking pins or plungers 8 are preferably provided with fingerholds 11 at their inner ends so that they may be conveniently manipulated either to lock the mold sections together or to permit their release.

In operation the mold sections are secured in closed position ,as in Figures 2 and 3, and a form 12 is located in the bottom of the mold. This form 12 may constitute a strip of wood or other suitable material having transverse blocks or strips 13 on its up per face. These blocks or stri s 13 are spaced apart as may be desire ,and on top of the form a sheet- 14 of waterproof material is located. This sheet 14 is corrugated before positioning on tlie mold and the corrugations are of appreciably greater width than the width of the strips 13, so that when the sheet 14 is placed onthe form the corrugations of the sheet 14 Will assume a dovetail formation. With the form and waterproof sheet positioned in the mold the concrete 15, preferably wet, is poured into the mold so as to fill the same flush with the upper edge as indicated in Figure 3. As soon as this material is sufliciently set, the mold is reversed and the form 12 reinto the mold on top of the waterproofing sheet 14 and smoothed or surfaced as may be desired and allowed to remain in the mold until sufiiciently set. When the block is ready for removal the mold sections 2 and 4 are disconnected and then the mold is swung -to open position, the hinge pins 6 permitting the waterproofing sheet 14 the passage of moisture through the block is absolutely prevented and the facing is secured to the block by a dovetail interlock.

Various slight changes and alterations might be made in the general form of the parts described without departing from our invention, and hence we do not limit ourselves to the precise details set forth but consider ourselves at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of the appended claims.

We claim:

1. The method of forming molded waterproof building blocks, which consists in inserting in the bottom of the mold a spacing bottom; in laying on said bottom asheet of waterproof material; in filling the mold space above the sheet with block material; in permitting the material to harden; in in verting the mold and its contents; in removing the spacing bottom; in filling the mold space above the opposite side of the sheet with block material; in permitting the block material to harden and in removing the completed block from the mold.

proof building blockswhich consists in inserting in the bottom of the mold a spacing bottom; in laying horizontally on said mold bottom a sheet of waterproof material having on opposite sides complementary depressions dovetail in section; in filling the mold space and dovetail depressions of the sheet with the soft block material; in permitting the soft block material to harden; in inverting the mold and its contained proof building blocks which consists in 'inserting in the bottom of the mold a spacing bottom having a series of ribs on its inside; in forming in a sheet of flexible waterproof material corrugations corresponding to the ribs but deeper and wider than the same; in contracting the sheet horizontally so as to dovetail the corrugations; in laying the corrugated sheet on the ribbed mold bottom so that the open corrugations will rest 011 the bottom-between the ribs and the closed corrugations will rest on the ribs; in filling the mold space above the sheet and the dovetail corrugations therein with the soft block material; in permitting the material to harden; in inverting the mold and its contents, and removing the ribbed spacing bottom; in filling the opposite mold space and dovetail corrugations of the sheet with soft block material; in permitting the material to harden; and in removing the completed block from the mold.

4. Means for forming molded waterproof building blocks, comprising a mold, a removable bottom to fill the space in the bottom of the mold and having elevations on its inside and a sheet of waterproof material having on opposite sides complementary depressions dovetail in section and corresponding to the elevations on the bottom, the open depressions to rest on the bottom, between the corresponding elevations and the closed depressions to rest on the corresponding elevations of the bottom.

5. Means for forming molded waterproof building blocks by molding material on opposite sides of a waterproof sheet formed 2. The method of forming molded waterwith dovetail corrugations, comprising a mold, and a removable bottom to fill the space in the bottom of the mold, said bottom having in its inside a series of parallel corrugations corresponding to but a little narrower and'lower or shallower than the dlpvetail corrugations in the waterproofing s eet.

DONALD MoPHERSON. FREDERICK B. SCHULTZ. 

